Sound-box for talking-machines.



T. H. MACDONALD. SOUND BOX FOR TALKING MAOHINES.

APPLICATION FILED MAY 10. 1911.

Patented. Jail. 9, 1912.

miiirieui iiy heretofore QXPGY'iH'XCQCi when the openings have been in aplane of the cover pnraliei with the surface of fine (hephmgm.

Meree'vey, file stylus-bar is itself preteeteci throughnui a greaterpoi-tum. 01': it: extent from injin-y by being strum by i m ClitllO]? Istylus-bur, ivhieh heiJ. in position by fliesznne retaining means thatholds the diaphragm and gal. miss in position, thus cheepening andsimplifying; the eensiructien, and I have, at the M12110 time, providedsuitable epenin fer the air 01" SOUfHi-Wz1V8S in the senndimx, whichopenings, however, will not permit of injury to the diaphragm. byanything projecting through such openings.

Having thus described the invention, What is elainied is 1. In asoumhbox for talking machines, a sound-box frame having diaphregi'n'rwlemme I eeiving; chamber, a diaphragm in said chem ber, we gaskets insaid chamber, one on each side of the i pei'iphei'y of the diaphragm, aeover resting upon the enter gnskei, and an eiasiie retaining lingresting upen the periphery of said cover and having a flange eniering anannular groove in ihe said flit phrngni chamber, whereby 5111 Sue partsare secured in positinn by said ring.

In a sound-box. fer talking machines, a sound-hex mine provided Wiih adiaphragm chamber, a cliziph i'ngin in said chamzer, a cover ever saiddiaphragm, which cover providml with a wail or portion extendingsubstnni'iziiiy at right angies be the surface of the diapi'nrugin, andhaving openings or perforations formed in said Wall or pOlUOi'L iniesiimeny whereof I have'signed this SPCCifiCflifiOD in the presence 0ftwo subscribing witnesses.

Witnesses ANNA R. Die-WEAR, ELSE; CARTMEL.

